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A standard mailing envelope is $0.40. Common invitation envelopes are sized in A2, A6, A7. A2 are small enough that you would use for your RSVP cards, A6 is mailing envelope that fits 4-3/8 x 6â³ size invitations, generally on the smaller size, and A7 fits the 5Ã7 size of invitation cards. How to cut cost on envelopes:
Steps. 1  1. Watch your weight. The heavier your wedding invitation is, the more it will cost to send. 2  2. Consider the shape. Oversized and irregular shaped envelopes also cost more to mail. 3  3. Use postcards. Rather than including an RSVP card, use a postcard.  4. Stock up on Forever stamps.